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Finding the Fourth Proportional to 643,980.30, 888,715.71 and 357,504.90

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Solution

The fourth proportional to 643,980.30, 888,715.71 and 357,504.90 is: 493,369.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,980.30 : 888,715.71 = 357,504.90 : x
  2. Step 2: Convert to fraction form
    643,980.30/888,715.71 = 357,504.90/x
  3. Step 3: Cross multiply
    643,980.30x = 888,715.71 × 357,504.90
  4. Step 4: Simplify right side
    643,980.30x = 317,720,221,031.98
  5. Step 5: Solve for x
    x = 317,720,221,031.98/643,980.30
  6. Step 6: Final answer
    x = 493,369.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.